syntax = "proto2";

enum MessageType {
     UNKNOWN = 0;
     GREETING = 1;
}

message CustomType {
}

message Envelope {
    MessageType type = 1;
    string name = 2;
    bool flag = 3;
    float weight = 4;
    int32 id = 5;
    repeated string tags = 6;
    repeated int32 numbers = 7;
    bytes bytes = 8;
    CustomType custom = 9;
    repeated MessageType types = 10;
}